diff --cc core/modules/ckeditor/js/plugins/drupalimage/plugin.js
index 80921c2,3686baf..0000000
--- a/core/modules/ckeditor/js/plugins/drupalimage/plugin.js
+++ b/core/modules/ckeditor/js/plugins/drupalimage/plugin.js
@@@ -42,12 -42,14 +43,14 @@@
              'data-entity-uuid': ''
            }
          });
-         var allowedContentDefinition = {
-           element: 'img',
-           styles: {},
-           attributes: {
-             '!data-entity-type': '',
-             '!data-entity-uuid': ''
+         var allowedContent = {
+           img: {
+             attributes: {
 -              '!data-entity-type': true,
 -              '!data-entity-uuid': true
++              '!data-entity-type': '',
++              '!data-entity-uuid': ''
+             },
+             classes: {},
+             styles: {}
            }
          };
          var imgAttributes = widgetDefinition.allowedContent.img.attributes.split(/\s*,\s*/);
diff --cc core/modules/ckeditor/js/plugins/drupallink/plugin.js
index e9fb555,f015504..0000000
--- a/core/modules/ckeditor/js/plugins/drupallink/plugin.js
+++ b/core/modules/ckeditor/js/plugins/drupallink/plugin.js
@@@ -13,17 -13,16 +13,18 @@@
      init: function (editor) {
        // Add the commands for link and unlink.
        editor.addCommand('drupallink', {
-         allowedContent: new CKEDITOR.style({
-           element: 'a',
-           styles: {},
-           attributes: {
-             '!href': '',
-             'target': ''
+         allowedContent: {
+           a: {
+             attributes: {
+               '!href': true,
 -              target: true
 -            }
++              'target': true
++            },
++            styles: {}
            }
-         }),
+         },
          requiredContent: new CKEDITOR.style({
            element: 'a',
 +          styles: {},
            attributes: {
              href: ''
            }